#pragma once

#include "byteStream.hpp"
#include "clientApdu.hpp"
#include "emptyServerApdu.hpp"
#include "getResponseNormalApdu.hpp"
#include "securityResponseApdu.hpp"
#include "serverApdu.hpp"

class Dlt698Frame {
private:
    static inline uint8_t _frameHead = 0x68;
    static inline uint8_t _frameTile = 0x16;

    static inline auto _minNoneLeaderDlt698FrameLength = 1 + 2 + 1 + 1 + 6 + 1 + 2 + 3;
    static inline auto _minDlt698FrameLength = _minNoneLeaderDlt698FrameLength + 4;

    static inline ByteStream _leaderCode = {0xfe, 0xfe, 0xfe, 0xfe};

    // clang-format off
    inline static const uint16_t fcstab[256] = {
        0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed,
        0xcb64, 0xf9ff, 0xe876, 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, 0xbdcb, 0xac42,
        0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3,
        0x263a, 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, 0x7387, 0x620e, 0x5095, 0x411c,
        0x35a3, 0x242a, 0x16b1, 0x0738, 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, 0x9489,
        0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef,
        0x4c74, 0x5dfd, 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, 0x4a44, 0x5bcd, 0x6956,
        0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
        0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78,
    };
    // clang-format on
    ByteStream _stream;

public:
    Dlt698Frame() = default;
    Dlt698Frame(const ByteStream &b)
        : _stream(b){};

public:
    static uint16_t calculateFcs(const ByteStream::const_iterator &begin, const ByteStream::const_iterator &end) {
        uint16_t fcs = 0xffff;
        for (auto it = begin; it != end; it++) {
            fcs = (fcs >> 8) ^ fcstab[(fcs ^ *it) & 0xff];
        }
        fcs = ~fcs;
        fcs = ((fcs >> 8) & 0xFF) | (fcs << 8);
        return fcs;
    }

    static uint16_t calculateFcs(const ByteStream::const_iterator &begin, std::size_t len) { return calculateFcs(begin, begin + len); }

    bool hasLeaderCode() const { return _stream.beginWith(_leaderCode); }

private:
    ByteStream apdu(void) const {
        if (hasLeaderCode() && _stream.length() > _minDlt698FrameLength) {
            return ByteStream(_stream.begin() + 18, _stream.end() - 3);
        } else if (!hasLeaderCode() && _stream.length() > _minNoneLeaderDlt698FrameLength) {
            return ByteStream(_stream.begin() + 14, _stream.end() - 3);
        }
        return {};
    }

public:
    const ByteStream &frame(void) const { return _stream; }

    std::unique_ptr<ServerApdu> serverApdu() const {
        auto a = apdu();
        if (a.empty()) {
            return std::make_unique<EmptyServerApdu>(a);
        }

        if (a[0] == SecurityApduType::SECURITY_RESPONSE) {
            a = SecurityResponseApdu(a).apdu();
        }

        if (a[0] == ServerApduType::GET_RESPONSE) {
            return std::make_unique<GetResponseNormalApdu>(a);
        }

        return std::make_unique<EmptyServerApdu>(a);
    }

    const ByteStream &buildRequest(uint8_t clientAddr, uint8_t ctrlCode, const ByteStream &addr, const ClientApdu &apdu) {
        auto context = apdu.frame();

        _stream << _frameHead << 0x00 << 0x00 << ctrlCode << 0x45;
        _stream << addr << clientAddr << 0x00 << 0x00 << apdu.frame() << 0x00 << 0x00 << _frameTile;

        _stream[1] = (_stream.length() - 2) & 0xff;
        _stream[2] = (_stream.length() - 2) >> 8 & 0xff;

        uint16_t hcs = calculateFcs(_stream.begin() + 1, 11);
        _stream[12] = hcs >> 8 & 0xff;
        _stream[13] = hcs & 0xff;

        uint16_t fcs = calculateFcs(_stream.begin() + 1, _stream.end() - 3);
        _stream[_stream.length() - 3] = fcs >> 8 & 0xff;
        _stream[_stream.length() - 2] = fcs & 0xff;

        return _stream;
    }
};
